S-block consists of metals ( alkali metals and Alkaline Earth metals ) , the metals form oxides which are basic in enough. This means when the oxides of the metals are made to react with water they form bases. For example Sodium is an s-block , when sodium oxide is made to react with water, it forms sodium hydroxide which is a strong base . Magnesium an alkaline earth metal also reacts with oxygen to form magnesium oxide which when reacted with water forms magnesium hydroxide, a base ,though is weaker than sodium hydroxide.
p-block consists of both metals and non-metals. They are separated by a recognizable staircase shaped position which represents metalloids ( semi – metals ) . The metallic oxide e.g aluminum is an amphoteric oxide ( can react with acids and bases) . The non metallic oxides are acidic in nature. For example sulphur (iv) oxide and phosphorus (v) oxide form acidic solutions when reacted with water.
In p-block, when you move from Left to right in a period, the acidic character of oxides increases due to increase in electronegativity.
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